In this program, Agiltron, Inc. and RTI International propose a four-color sensor based on SiGe alloys. The sensor will provide sequential detection in the UV, visible, near infrared (NIR), and mid-wave infrared (MWIR) bands. The sensor is composed of a stack of photodiodes sensitive to different bands of radiation to achieve broadband detection. The photodiodes are activated sequentially by implementing a novel voltage-tuning scheme. Our goal is to develop the first single UV/Vis/NIR/MWIR integrated sensor to cover the whole range of threats faced by Army rotary wing platforms. As a technical demonstration, we will deliver a four-color 320 256 imaging sensor sensitive to all four wavebands.